Planted a few conifer trees.
Used some of the materials I used a few years ago when making 18" pine trees.
Cut the furnace filter into squares, rip them apart to make them thin and push them onto the 'trunks'.
Used the cheap hair spray again and sprinkled dark green foam from the bottom and some lighter green from the top.
Didn't even have to cut the corners off as the foam fills in the edges. Being on a steep rock face, the trees have to be very narrow. Three 12" and two 6" trees were made to insure they fit on the rock face. Both are limited to where there is a large rock outcropping. When all the small 2"-5" trees arrive, those will fill in the 'voids'.
The 12" needed drilling into the rock but the 6" works well by just sticking the trunk into the 'brush' as it's about an inch thick in places.
A picture will always let you know if you've got a crooked tree!